Instrumental Duet Alto Saxophone,Instrumental Duet,Trombone - Level 3 - Digital Download SKU: A0.784215 Composed by Kenny Ascher and Paul Williams. Arranged by John Groves. Contemporary,Film/TV. Score and parts. 3 pages. John Groves #6859241. Published by John Groves (A0.784215). The Rainbow Connection from The Muppet Movie - arranged for Alto Sax & Trombone Duet.